Hack saw



June 10 1924.

P. CUNNEEN HACK SAW Filed March 29. 1923 gnuemtoz Patented June 10, 1924.

PETER CUNNEEN, OFNEW ROCHELLE, NEW YORK HACK saw.

Application filed March 29, 1923. Serial No. 628,609. I

To all whom it may concern p Be 1t known that I, PETER CUNNEEN, a citizen of the United States, residing at New .liochelle, county of W estchester, State of New York, have invented certain new and useful Improvements in Hack Saws,of which the following is a specification.

My invention relates to hack saws, and has for its objects to provide certain improvements in the construction of the same, more particularly defined as follows:

First, an improved means for quickly adjusting the tension of the saw blade.

Secondly, an improved construction of reversible frame, whereby the depth of the cutof the saw may be varied as desired.

Thirdly. an improved constru -tion of the handle, whereby the same may be adjusted laterally with respect to the cutting plane of the saw.

In the accompanying drawing Figure 1 is a side elevation of my improved device.

Figure 2 is a view similar to Figure 1, showing a reversal of the back bar, the handle portion being broken away.

Figure 3 is a top plan view of the device.

Figure 4 is a detail longitudinal sectional view, on the line IVIV of Figure 1.

Figure 5 is a transverse sectional view, taken on the line V-V of Figure 1.

Figure 6 is an enlarged detail perspective view of the tensioning bracket.

Similar numerals of reference denote cor: responding parts in the several views.

In the said drawing, the main frame of the device embodies upper and lower parallel members 1, 2, connected by an integral inclined front member 3, the latter bein slotted for the reception of the rear end 0 the saw blade 4.. Fixed between the upper and lower members 1, 2 is a vertical pintle 5,- to which are pivoted the arms 6 of the han-' dle 7, said handle immediately to the rear of said pintle 5 on its upper side being provided with a plurality of holes or apertures 8, preferably three in number, adapted to receive therein the lower end of a set screw 9 screw-threaded into the upper member 1, as shown. I also provide an underscrew 10 adapted to engage in a single central aperture in the under side ofthe handle for more efi'ectuallylocking the latter in its adjustedposition, shown in full lines in Figures 1 and 3, though this screw 10 may, if desired, be

dispensed with.

Formed integral with the mainframe of the device and projecting upwardly therefrom is a U-shaped bracket 11 adapted to receive one end of the'back frame 12 of the device, the latter being shown bent angularly intermediate its length. This back frame is reversible. asshown in Figures 1 and 2, and is adapted to be fixed detachably in position in said U-member 11 by a pin13. In the position shown in Figure 1 this frame 1.2, which is slotted to receive the back of the saw blade, 4. will embrace said saw blade for the reater portion of the length of the latter, thereby limiting the depth of the out. But when it is desired to effect a deeper cut, the frame 12. by withdrawing the pin 13, may be removed from the mainframe and reversed-to the position shown in Figure 2, thereby exposing the saw blade 4 for the greater portion of its length, and permitting a much wider cut, as readily will be understood. 1

The front end of the saw blade is attached detachably to the frame 12 by a pin 14 and its rear end is similarly attached by a pin 15 to a bracket 16, disposed between the arms 1 and 2 of the main frame, said bracket being suitably slotted at 17 to receive the rear end of the saw blade 4. Said bracket is provided with a pair of rearwardly projecting lugs 18 adapted to embrace the pintle 5, and is also formed with a pair of forwardly projecting lugs 19, adapted to embrace the inclined portion 3 of the main frame, whereby vertical movement is permitted to said bracket, but displacement therefrom with respect to the main frame effectually is prevented. Ta ped through the upper arm 1 of the main rame is a setscrew 20, Whose lower end is adapted to engage the upper face of said bracket 16, the inclined forward face of the latter, which abuts against the inclined member 3 of the main frame, causing said bracket, when forced downwardly by said set-screw 20, to move gradually rearward, thereby putting the saw blade 4 under any desired tension.

In order that the device may be operated on a fiat surface with the saw blade fiat against saidsurface, it is desirable that the handle 7 be capable of adjustment out of the plane of the saw blade to either side, as shown in dotted lines in Figure 3. This is accomplished by withdrawing the set-screws 9 and 10, and shifting said handle on its pintle 5 to one side or the other, and then locking the same in either adjusted position by again engaging th set-screw 9 with one of the offset; holes 8 in the handle, in a manner readily understood.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A hack saw holder, embodying a main frame, a bracket movably disposed therein, said frame and bracket having cooperating inclined surfaces, means for detachably attaching to said bracket the rear end of a saw-blade, and means for adjusting said bracket, through said inclined surfaces, longitudinally of the main frame.

2. A hack saw holder, embodying a main frame, a bracket movably disposed therein, said frame and bracket having cooperating inclined surfaces, means for detachably attaching to said bracket the rear end of a saw-blade, means for adjusting said bracket, through said inclined surfaces, longitudinally ofth main frame, and means for preventing the removal of said bracket from said main frame.

3. A hack saw holder, comprising a main frame embodying upper and lower parallel members and a connecting inclined member, a bracket movably disposed between said upper and lower members and formed with a forward inclined face cooperating with the rear face of said inclined member, means for detachably attaching to said bracket a sawblade, and a set-screw in said main frame engaging said bracket to force the latter downward and rearwardthrough the con tact of said inclined faces.

4. A hack saw holder, comprising a main frame embodying upper and lower parallel members and a connecting inclined iiicinbci', a bracket Inovably disposed between said upper and lower members and formed with a forward inclined face cooperating with the rear face of said inclined member, means for detachably attaching to said bracket a sawblade, lugs on said bracket engaging said main frame for preventing lateral displacement of said bracket, and means for adj usting said bracket, through said inclined faces, longitudinally of the main frame.

5. A hack saw holder, embodying a main frame, and an endwise reversible back frame detachably secured therein and adapted at its projecting end to be engaged detachahly by a saw-blade. said back frame being bent intermediate its length in the cutting plane of the saw-blade to vary the spacing of the same from said saw-blade.

6. A hack saw holder, embodying a main frame, a saw-blade carried thereby, a pintlc in said frame, a handle pivoted on said pintle, means for locking said handle in an of a plurality of adjusted positions, and an adjustable bracket in said frame for tension: ing said saw-blade, said bracket slidably engaging said pintle whereby its lateral displacement from the main frame is prevented.

In testimony whereof I hereunto afi'ix my signature.

PETER CUNNEEN. 

